How are the cells in multicellular organisms different from those in single-celled organisms?

Single-celled organisms are made of only one cell. Multi-cellular organisms, such as plants and animals, have a higher degree of specialization where the cells work together and function Single-celled organisms are made of only one cell. Multi-cellular organisms, such as plants and animals, have a higher degree of specialization (the adaptation of an organism or organ to a special function or environment)where the cells work together and function to create a living organism.

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.